76101. If a line having Z0 = 300 ∠ 0 W is open circuited at far end, VSWR is
76102. If f is the frequency of electromagnetic wave, fc is cutoff frequency, then in a rectangular waveguide
76103. Assertion (A): The condition of minimum distortion in a transmission line is L = RC/G.Reason (R): Line loading means addition of inductance to satisfy the condition L = RC/G.
76104. A magnetron has a cylindrical cathode surrounded by an anode structure having cavities opening into interaction space by means of slots
76105. The correct sequence of parts in klystron amplifier are
76106. A transmission line has Z0 = 300 Ω and ZL = (300 - j300) ohm. The transmission coefficient is
76107. In a reflex klystron oscillator, repeller electrode is at
76108. A quarter wave line short circuited at load end behaves as
76109. A (75 - J50) ohm load is connected to a coaxial of Z0 = 75 ohm at 10 GHz. The best method of matching is to connect
76110. The width of a radio beam from a 1 m diameter parabolic antenna at 1 GHz is about
76111. Which one of the following is transferred locking electron device C antenna?
76112. A magnetron requires an external magnetic field with flux lines parallel to axis of cathode
76113. When a line short circuited at far end, the minimum voltage occurs at
76114. In a TWT the axial component of electric field advances along the tube
76115. If other parameter are constant, transmission loss at 5 GHz as compared to that at 0.5 GHz is
76116. For a circular wave guide
76117. In the given figure the reflected voltage wave after first reflection is
76118. Assertion (A): A half wavelength line can be used as a 1 : 1 transformer.Reason (R): The input impedance of a half wavelength line is equal to load impedance.
76119. The magnitudes of OC and SC input impedances of a transmission line an 100 Ω and 25 Ω. The characteristic impedance is
76120. A loss less line is terminated in a circular lines are E lines
76121. Which of the following terminations makes the input impedance of a line equal to characteristic impedance Z0?
76122. In microwave system the function of mode filter is
76123. The total field developed by an antenna array at a distant point is
76124. High speed logic circuits use
76125. To couple a coaxial line to a parallel wire line it is best to use
76126. Assertion (A): A quarter wave transformer is used to match a resistive load to a transmission line.Reason (R): A quarter wave transformer is a transmission line of quarter wave length.
76127. Assertion (A): Magnetron is generally used in n mode.Reason (R): Frequency for p mode can be easily separated from adjacent modes.
76128. A balun should have
76129. Assertion (A): The velocity factor of a line is the ratio of wave velocity on the line to speed of light.Reason (R): If the conductors of a line are immersed in a non magnetic insulating liquid, the wave velocity increases.
76130. In mode filter of the given figure which of the following modes is unaffected
76131. The directive gain of a transmitting antenna is
76132. A duplexer is used to
76133. A branched duplexer requires
76134. In a backward wave oscillator the wave
76135. A coaxial line has L = 500 nH/m and C = 50 pF/m. The characteristic impedance is
76136. The main feature of a parametric amplifier is
76137. Assertion (A): PIN diode is commonly used for microwave control.Reason (R): A PIN diode uses heavily doped p and n materials.
76138. In a vacuum tube, the transit time of electron between cathode and anode is important at
76139. Assertion (A): A line of length and short circuited at far end has an input impedance of infinity.Reason (R): A line of length and short circuited at far end behaves as a parallel resonant circuit.
76140. A cavity resonator is
76141. If antenna diameter is increased four times, the maximum range is increased by a factor of
76142. Assertion (A): Gunn diode is a transferred electron device.Reason (R): A Gunn oscillator uses the phenomenon of transferred electron effect.
76143. Atomic and molecular resonance is observed in many substances
76144. The component in the given figure is
76145. The semiconductor diode which can be used in switching circuit in microwave range is
76146. In the given figure the reflected current wave after first reflection is
76147. A line has an attenuation of 0.054 Np/m. The attenuation in decibels is
76148. If a line is open circuited Zin = Z0 tanh (gl).
76149. A reflex klystron oscillator uses
76150. A coaxial RF cable has a characteristic impedance of 50 Ω and C equal to 40 pF/m. The inductance is
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